package com.krain.meijusky.util;

import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

import org.androidannotations.annotations.Background;
import org.androidannotations.annotations.EBean;

/**
 * Created by paveld on 3/6/14.
 */
@EBean
public class FastBlur {

    /** 水平方向模糊度 */
    private static float hRadius = 10;
    /** 竖直方向模糊度 */
    private static float vRadius = 10;
    /** 模糊迭代度 */
    private static int iterations = 7;

    /**

     * 高斯模糊

     */

    public static Bitmap doBlur(Bitmap bmp) {

        int width = bmp.getWidth();

        int height = bmp.getHeight();

        int[] inPixels = new int[width * height];

        int[] outPixels = new int[width * height];

        Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);

        bmp.getPixels(inPixels, 0, width, 0, 0, width, height);

        for (int i = 0; i < iterations; i++) {

            blur(inPixels, outPixels, width, height, hRadius);

            blur(outPixels, inPixels, height, width, vRadius);

        }

        blurFractional(inPixels, outPixels, width, height, hRadius);

        blurFractional(outPixels, inPixels, height, width, vRadius);

        bitmap.setPixels(inPixels, 0, width, 0, 0, width, height);

        return bitmap;

    }




    public static void blur(int[] in, int[] out, int width, int height,

                            float radius) {

        int widthMinus1 = width - 1;

        int r = (int) radius;

        int tableSize = 2 * r + 1;

        int divide[] = new int[256 * tableSize];



        for (int i = 0; i < 256 * tableSize; i++)

            divide[i] = i / tableSize;



        int inIndex = 0;



        for (int y = 0; y < height; y++) {

            int outIndex = y;

            int ta = 0, tr = 0, tg = 0, tb = 0;



            for (int i = -r; i <= r; i++) {

                int rgb = in[inIndex + clamp(i, 0, width - 1)];

                ta += (rgb >> 24) & 0xff;

                tr += (rgb >> 16) & 0xff;

                tg += (rgb >> 8) & 0xff;

                tb += rgb & 0xff;

            }



            for (int x = 0; x < width; x++) {

                out[outIndex] = (divide[ta] << 24) | (divide[tr] << 16)

                        | (divide[tg] << 8) | divide[tb];



                int i1 = x + r + 1;

                if (i1 > widthMinus1)

                    i1 = widthMinus1;

                int i2 = x - r;

                if (i2 < 0)

                    i2 = 0;

                int rgb1 = in[inIndex + i1];

                int rgb2 = in[inIndex + i2];



                ta += ((rgb1 >> 24) & 0xff) - ((rgb2 >> 24) & 0xff);

                tr += ((rgb1 & 0xff0000) - (rgb2 & 0xff0000)) >> 16;

                tg += ((rgb1 & 0xff00) - (rgb2 & 0xff00)) >> 8;

                tb += (rgb1 & 0xff) - (rgb2 & 0xff);

                outIndex += height;

            }

            inIndex += width;

        }

    }



    public static void blurFractional(int[] in, int[] out, int width,

                                      int height, float radius) {

        radius -= (int) radius;

        float f = 1.0f / (1 + 2 * radius);

        int inIndex = 0;



        for (int y = 0; y < height; y++) {

            int outIndex = y;



            out[outIndex] = in[0];

            outIndex += height;

            for (int x = 1; x < width - 1; x++) {

                int i = inIndex + x;

                int rgb1 = in[i - 1];

                int rgb2 = in[i];

                int rgb3 = in[i + 1];



                int a1 = (rgb1 >> 24) & 0xff;

                int r1 = (rgb1 >> 16) & 0xff;

                int g1 = (rgb1 >> 8) & 0xff;

                int b1 = rgb1 & 0xff;

                int a2 = (rgb2 >> 24) & 0xff;

                int r2 = (rgb2 >> 16) & 0xff;

                int g2 = (rgb2 >> 8) & 0xff;

                int b2 = rgb2 & 0xff;

                int a3 = (rgb3 >> 24) & 0xff;

                int r3 = (rgb3 >> 16) & 0xff;

                int g3 = (rgb3 >> 8) & 0xff;

                int b3 = rgb3 & 0xff;

                a1 = a2 + (int) ((a1 + a3) * radius);

                r1 = r2 + (int) ((r1 + r3) * radius);

                g1 = g2 + (int) ((g1 + g3) * radius);

                b1 = b2 + (int) ((b1 + b3) * radius);

                a1 *= f;

                r1 *= f;

                g1 *= f;

                b1 *= f;

                out[outIndex] = (a1 << 24) | (r1 << 16) | (g1 << 8) | b1;

                outIndex += height;

            }

            out[outIndex] = in[width - 1];

            inIndex += width;

        }

    }



    public static int clamp(int x, int a, int b) {

        return (x < a) ? a : (x > b) ? b : x;

    }
}

